Stable isotope signatures of deuterium, oxygen 18, and carbon 13 (δH, O, C) in imported apples available in the markets of Vietnam.

This study examines whether fresh apples from the United States, New Zealand, and China sold in the markets of Vietnam can be distinguished based on the stable isotopic signatures of their water and carbon (δH, δO, and δC). The δH and δO in apples from the United States were found to average - 100.1 ‰ and - 10.5 ‰ VSMOW, respectively, lighter than those from New Zealand and China. In apples from China, the δC averaged - 25.8 ‰, which is more enriched than apples from the United States and New Zealand. A clear distinction was shown in the δH, δO, and δC values in apple samples from the three regions based on the statistical treatment at a 95 % confidence level and  < 0.05. This method is reliable enough to control the import and export of agricultural products.